5-7.Which of the following faults is NOT5-12. What device should you use tolikely to be caused by too little draft indetermine the percentage of CO2an oil burner?produced by combustion?1.Firebox pressure2.Odors in the building3.Smoke4.Flame flare-up5-8.When the burner and draft areadjusted correctly, a flue-gas analysisshould indicate what percentage ofCO2?1.10 percent2.15 percent3. 20 percent4.30 percentshould be the maximum stacktemperature?5-9.When the furnace is large enough andthe burner is set for correct oil flowwith minimum amount of air, what1. 500°F2. 600°F3. 700°F4. 800°F5-10. What type of gauge measures suctionin the smoke pipe of an oil burner?1. Suction2. Draft3. Vacuum4. Barometric5-11. Suction in the smoke pipe orcombustion chamber of an oil burneris measured in1.inches of mercury2.centimeters of mercury3.inches of water4.cubic centimeters of water1. Flue-gas analyzer2. Draft analyzer3. Stack analyzer4. Gas-burner analyzer5-13. To test fuel pump valve operation,remove the nozzle line at the pumpconnection, start and stop the pump,and observe whether the valve cuts offsharp and clean.1. True2. False5-14. When the pressure regulator of thefuel pump requires adjustment, youshould use which of the followingtools?1. Phillips head screwdriver2. Allen wrench3. Inch-pound torque wrench4. Tack hammer5-15. Refer to appendix II, table M. Whenyou troubleshoot an oil pump, what isthe most likely cause of noisyoperation?1. Restricted intake line2. Broken coupling3. Air in the inlet pipe4. Loose plugs or fittings5-16. A cast-iron hot-water boiler is capableof developing what maximumhorsepower?1.302.553.804.9837